Under the direction of Middlebury College Professor of Chemistry and Biochemistry Sunhee Choi, Middlebury College senior Adam Beard and juniors Darcy Knowles and Livia Vastag examined the oxidation process thought to destroy cancer-damaged DNA. By inducing an oxidation process, the anti-cancer drug cisplatin, known as the "Lance Armstrong drug," impacts a relatively small range of cancers. The Choi research team investigated another platinum compound called tetraplin, which Choi has discovered also binds and oxidizes DNA. Choi and her three research assistants hope their efforts will further scientific understanding and broaden the current pharmaceutical reach toward treatment of cancer.
Middlebury College senior Adam Beard, joined by junior Livia Vastag, analyze data gleaned from their work this summer in the lab with Middlebury College Professor of Chemistry and Biochemistry Sunhee Choi. Photo by Ari Joseph, courtesy of Middlebury College
Choi, Beard, Knowles and Vastag not only worked to determine how quickly tetraplin binds and oxidizes DNA, they also tested other platinum compounds for qualities that would bind and oxidize DNA.In the lab, the students studied synthesized platinum compounds to determine how and whether their structures and thermodynamic properties affect reaction rates. Beard and Vastag synthesized platinum compounds and used spectroscopy to identify several others. Beard, a chemistry major with a minor in music, also measured their reduction potential using a process called cyclic voltametry, and Vastag, a double-major in economics and chemistry, analyzed data and identified final products produced from the reaction of platinum compounds and guanosine derivatives. A chemistry major, Knowles tracked, over time and at different temperatures, the spectra of some of these reactions. She fit the spectra to kinetic equations using a computer program, and identified rate constants and kinetic parameters.
|Knowles' lab work this summer tracked reactions of platinum compounds and guanosine derivatives. Photo courtesy of Darcy Knowles|
Choi's 2004 summer research team last year, which included both Knowles and Vastag, saw the results of their work published in the Journal of the American Chemistry Society. Along with Choi, Knowles' and Vastag's names were included as researchers for that article, titled "Oxidation of Guanosine Derivatives by a Platinum (IV) Complex: Internal Electron Transfer through Cyclization." Choi also plans to include Beard's name with those of Knowles and Vastag in any publication resulting from the 2005 summer's work.
"When I discovered that Sunhee's lab had an opening, I jumped at the opportunity," said Beard, who took a course on physical chemistry with Choi during the previous academic year. He is planning to build his senior thesis around synthesizing platinum compounds and observing how they react with various guanine residues. "The work I'm doing here this summer will familiarize me with Sunhee's lab so I know what I'm doing when it comes time to start my own thesis research this coming school year," he said. After graduation from Middlebury, he hopes to attend graduate school in chemistry. "I'm not sure whether graduate school will lead to research or teaching," Beard said.